Update Roxygen to version '7.3.3'

[StuartWheater]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.42%. Comparing base (e6c3bcb) to head (85bd6b2).
⚠️ Report is 35 commits behind head on v6.3.4-dev.
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Additional details and impacted files

@@             Coverage Diff             @@
##           v6.3.4-dev     #426   +/-   ##
===========================================
  Coverage       29.42%   29.42%           
===========================================
  Files             138      138           
  Lines            5729     5729           
===========================================
  Hits             1686     1686           
  Misses           4043     4043           

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